to check the status property in their probe routines.
Simplebus used to only instantiate its children whose status="okay"
but that was improper behavior, fixed in r261352. Now that it doesn't
check anymore and probes all its children; the children all have to
do the check because really only the children know how to properly
interpret their status property strings.
Right now all existing drivers only understand "okay" versus something-
that's-not-okay, so they all use the new ofw_bus_status_okay() helper.
Implement an FDT attachment for altera_avgen(4).
Portions of the changeset updating DTS and device.hints will be merged
separately.
Sponsored by: DARPA, AFRL
Rework altera_avgen(4) to cleanly(ish) separate nexus bus
attachment from the driver itself. This should allow us to
plug in an fdt attachment more easily.
Sponsored by: DARPA, AFRL
Start restructuring of altera_avgen(4) so that it can have an FDT
attachment -- this requires first properly breaking out the current
nexus attachment from the driver implementation.
Sponsored by: DARPA, AFRL
CPU cores on Altera FPGAs. The device driver allows memory-mapped devices
on Altera's Avalon SoC bus to be exported to userspace via device nodes.
device.hints directories dictate device name, permissible access methods,
physical address and length, and I/O alignment. Devices can be accessed
using read(2)/write(2), but also memory mapped in userspace using mmap(2).
Devices attach directly to the Nexus, as is common for embedded device
drivers; in the future something more mature might be desirable. There is
currently no facility to support directing device-originated interrupts to
userspace.
In the future, this device driver may be renamed to socgen(4), as it can
in principle also be used with other system-on-chip (SoC) busses, such as
Axi on ASICs and FPGAs. However, we have only tested it on Avalon busses
with memory-mapped ROMs, frame buffers, etc.
Sponsored by: DARPA, AFRL
